<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="./index.css">
</head>
<body>
  <div class="header">HEADER</div>
  <div class="playground">
    <div class="animation-container">
      <div class="list">
        <div data-order="0" class="list-item">0</div>
        <div data-order="1" class="list-item">1</div>
        <div data-order="2" class="list-item">2</div>
        <div data-order="3" class="list-item">3</div>
        <div data-order="2" class="list-item">2</div>
        <div data-order="1" class="list-item">1</div>
        <div data-order="0" class="list-item">0</div>
        <div data-order="0" class="list-item">1</div>
        <div data-order="1" class="list-item">1</div>
        <div data-order="2" class="list-item">2</div>
        <div data-order="3" class="list-item">3</div>
        <div data-order="2" class="list-item">2</div>
        <div data-order="1" class="list-item">1</div>
        <div data-order="0" class="list-item">0</div>
      </div>
    </div>
  </div>
  <div class="footer">FOOTER</div>
  <script src="./index.js"></script>
</body>
</html>